Elevating-jack.



PATENTBD JULY s1, 1906.

Noi 827,505.`

THOMAS J. COPE, OF PHILADELPHIA, PENNSYLVANIA.

ELEVATlNC-u-LIACK.-j

Specification of Letters Patent.

Patented July 31, 1906.

Application iiled October 21,1905. Serial No. 283,765.

I To all whom it may concern:

Be it known that l, THoivms J. Corn, a citi- Zen of the United States,residing in the citT and county of Philadelphia, State of Penn-Sylvania, have invented a new and useful Elevating-Jack, of which thefollowing is a specification.

My invention consists of an elevating-jack comprising a follower, a headfor operating IO the same, and means for holding it in adjusted positionrelatively to the differences in extent of the load imposed upon it.

It also consists of means for vertically adjusting the head so that agreater range of I; vertical motion may be obtained for action upon thefollower.

It also consists of details of construction, as will be hereinafter setforth.

Figure l represents a perspective view of an elevating jack embodying myinvention. Figs. 2 and 3 represent vertical sections thereof, showingcertain members of the device in different positions. Fig. l representsa section of a portion at a right angle to that shown in Fig. 3.

Similar letters of reference indicate corresponding parts in thefigures.

Referring to the drawings, A designates a standard of the jack, and Bthe base thereof.

C designates a cam-head which is mounted by the axle D on the standardA, it being noticed that the sides of the standard are slotted, forminga series of teeth E, one above the other, on which the aXle D may beplaced, thus providing for placing said cam-head O at differentaltitudes.

F designates a follower which is fitted within and guided by the wallsof the standard A and carries at its lower end the roller G, which isadapted to ride upon the periphery of said cam-head O, it being noticedthat said periphery is provided with a number of recesses H, into eitherof which said roller is adapted to drop and rest, as most plainly shownin Fig. 2. The periphery of the camhead is also provided withratchet-teeth J, which are preferably sunken below the portion of theperiphery containing the recesses H and adapted to be engaged by the dogor pawl K, which has its bearings L on the lower portion of the followerF.

In the periphery of the cam-head is a series of openings M, either ofwhich is adapted to receive the end of the rod or handle N, where- 55 bysaid head may be rotated.

The operation is as follows: For elevating an object of ordinary weightthe pawl K is raised clear of the ratchet-teeth J and thrown against thefollower F, so as to beinoperative, as shown in Fig. 2. The rod N is nowin- 6o serted in one of the openings M as a handle and manipulated,whereby rotary motion is imparted to the cam-head C, and then insertedin another of said openings, thus further rotating said cam-head, theswell of the latter with which the roller G is in contact then causingthe ascent `of the follower F, it being noticed that when the properheight of said lfollower is reached said roller occupies the respectiverecess H in the cam-head below it, 7o (see Fi 2,) and the weightsuperimposed on said fo lower causes said roller to retain its positionin said recess, preventing the descent or dropping of the follower, andconsequently of the load. The pawl or dog may now be engaged with theratchet, if so desired; but when the weight to be elevated is heavy saidpawl or dog K is primarily lowered, so that it may ride over the ratchetas the carnhead rotates, and when the latter ceases en- 8o gage with therespective tooth of said ratchetthus interlocking the cam-head andpreventing any possible returning motion of the latter, while mostfirmly controlling the follower F in its elevated position. When thejack is to be lowered, the dog or pawl K is thrown up, thus clearing theratchet-teeth J, when by proper manipulation of the rod N the' cam-headO may be rotated in reverse direction, causing the roller G to ride uponthe 9o narrow part of said head, thus lowering the follower.

ln order to assist in supporting the follower when in elevated position,l provide the same with a series of openings P, one below 95 the other,as shown in Figs. 2 and 3, in either of which may be placed the pin Q,the same being adapted to rest upon the top of the standard, as shown inFig. 4, the eHect of which is evident, it being seen that when the 1 oofollower is'raised to a certain height and it is desired to increasesaid height the pin Q may be inserted in one of theblower openings P orin the lowermost opening and rested on the top of the standard, afterwhich the 1o 5 cam-head is lowered, its axle B then being placed on oneof the teeth E at greater height or at the greatest height, when thecam-head may be again rotated, thus elevating the follower to a greaterextent. ,Y n I I0 Having thus described my invention, what I claim asnew, and desire to secure by Letters Patent, is

l. In an elevating-jack, a follower and an elevating-head therefor, thelatter being provided with a variable surface, the same having a seriesof separate openings therein and a removable handle adapted to be fittedin either of the latter.

2. In an elevating-jack, a follower and an elevating head therefor, thelatter being yadapted to have said follower engage thereon,

and being provided with separate means for interlocking said followertherewith comprising a series of recesses in the periphery of said headeither of which is adapted to receive the base of said follower, aratchet on said periphery and a pawl on saidfollower, said pawl beingadapted to engage either tooth of said ratchet.

3. An elevating-jack having a follower, an elevating-head therefor, the.la'tter being adapted to have-said follower engage therewith, a seriesof recesses on said head in either of which said follower may beseated,a ratchet on said head, and a pawl on said follower which is adapted toengage with either member of said ratchet.`

4. In an elevating-jack, a standard, a follower thereon, a rotatableelevating-head mounted on said standard andadapted to engage saidfollower, a ratchet on said head and a pawl on said follower adapted toengage a tooth of said ratchet.

`5. An elevating-jack consisting of a standard, a series of teeth on thelatter one above the other, a follower on said standard, said followerhaving a series of openings therein one above the other, anelevatingfhead adapted to be mounted on either of said teethI and engagesaid follower to raise it and apin adapted to be passed througheither-of-said openings and rest on said standard..

THOMAS J. COPE.

Witnesses:

Jol-1N A. WIEDERSHEIM, `S. R. CARR.

